Interestingly, even though the wormhole studied here possesses a single barrier effective potential (for non-extremal masses), with its throat located at the peak [1]} (similar to that of Bronnikov-Ellis [2]}, [3]} and Morris-Thorne [4]} wormholes), we still observe echoes in the late-time response of the test scalar field due to the existence of the effective AdS boundary. Moreover, if the wormhole is near-extremal or extremal, the response of the probe scalar field exhibits primary and secondary echoes, associated with the AdS boundary and throat potential well, respectively. The concatenation of echoes we observed here are very similar to those found in [5]}, though our setup consists of naturally arising trapping regions, solely depending on the spacetime and perturbation parameters, in contrast to the reflective boundaries placed by hand in [5]}.
